Means for locking nuts on bolts or the like.



H. DOLLMAN. OR LOCKING NU APPLICATION Fl TS 0N BOLTS OR THE LIKE. LEDDEC. 3:. 1914.

MEANS F Patented June 27, 1916.

FKCE,

HUBERT DOLLMAN', OF BIRMINGHAM, ENGLAND.

LIEANS FOR LOCKING NUTS ON BOLTS OR THE LIKE.

Specification of Letters Patent.

Patented June 27, 1916.

T 0 all whom it may concern Be it known that I, HUBERT DOLLMAN, retiredmechanical engineer, a subject of His Majesty the King of Great Britainand Ireland, residing at Baskerville Place, Broad street, in the city ofBirmingham, England, have invented certain new and useful Improvementsin Means for Looking Nuts on Bolts and the like, of which the followingis a specification.

This invention has reference to means for locking nuts on bolts and thelike, my invention comprising a nut having one or more cross grooves inits top face tangential to and slightly intersecting the tapped hole inthe nut in combination with one or more cross locking pegs engaging insuch groove or grooves and also engaging with a cross groove or crossgrooves in the bolt or stud, the nut being so constructed as to enablethe locking peg or locking pegs to be effectually secured in positionagainst the effects of vibration.

I will describe my invention by referring to the accompanying drawingsof which Figure 1 is a front sectional elevation of a lock nutconstructed and locked in position on a bolt in accordance with thisinvention; Fig. 2 is a plan of the same; Fig. 8 is an end elevation ofthe locking pin of the same. Fig. 4 is a side elevation of the samelocking pin; Fig.

5 is a front elevation of the lock nut alone, and Fig. 61 is a plan ofthe said lock nut. Fig. 7 is a plan of a modification of said lock nut.

A is the lock nut which according to my invention has two cross groovesmarked respectively 1, 2 formed in its upper face tangential to andslightly intersecting the tapped hole 3 for the boltat(or the nut may beformed with only one of these cross grooves) these cross grooves beingin such positions that the periphery of the bolt 4L projects into them.After the nut has been screwed and tight-- ened on to the bolt to therequired position, a cross groove 5 is filed across the periphery of thebolt l so as to correspond with one of the cross grooves and into this alocking peg such as 6 (Figs. 3 and 4c) is driven thereby engaging withboth the groove 1 of the nut and the groove 5 of the bolt andeffectually locking the nut in position on the bolt as in Figs. 1 and 2.

In order to prevent any possibility of the locking pin 6 getting out ofposition through vibrations, the outer wall 9 of each of the grooves 1,2 is so formed as an up-standing tongue or tongues that it or they canreadily be hammered down on to the side of the locking pin as in Figs. 1and 2, and thus secure the locking pin in place. The formation of theside wall 9 of the groove into an upstanding tongue to enable it to beclosed down as aforesaid is by means of a saw-cut 7 in the face of thenut at a short distance from and parallel with the face of the groove.The said locking pin 6 can be further secured by the extreme endportions 10 of the upstanding tongue 9 being bent around the ends of thelocking pin 6 as shown in Fi 2, thereby effectually preventing thelocking pin 6 from moving endwise. When it is desired to unlock the nutthis can be done by bending back the ends 10 of the tongue 9 andslightly bending up the tongue 9 itself so that the locking pin 6 can bedriven out of the groove and thus unlock the nut. To enable these ends10 of the tongue 9 to be bent around the ends of the locking pin 6 thelocking pin is made somewhat shorter than the length of the tongue 9.

The object of making the lock nut with two grooves 1, 2 is that if atsome time after the bolt has had the cross groove 5 formed in it toaccommodate the locking pin as aforesaid, it should be desired totighten up the nut the second groove in the nut will serve for the samegroove 5 in the bolt after the nut has been revolved through half a turnand in order to facilitate this the second groove 2 is by preferencemade slightly shallower by an amount equal to half the pitch of thethread than the first groove 1 so that when the nut is turned throughhalf a revolution as aforesaid the bottom of the second groove in thenut will be about level with the bottom of the groove 5 of the bolt,which would not be the case if both the grooves in the nut were made ofthe same depth.

The groove or grooves may either be parallel with the adjacent sides ofthe nut as shown in Figs. 1, 2, 5 and 6 or may be disposed in any otherway with reference to the sides. Moreover if desired in order tofacilitate the bending over of the tongue 9 the latter may by one ormore cross cuts as shown in Fig. 7 be divided into shorter tongues whichcan be turned down independently of one another. Although for purposesof illustration I show a hexagonal nut constructed in accordance with myinvention, it is equally applicable to other forms of nuts.

lVhen the nut is tapped with a hole of the next larger size, as forinstance a one inch nut tapped one inch and one eighth, so that theouter walls of the grooves are then so thin that the cutting of asaw-cut 7 such as shown in Figs. 5 and 6 would be impracticable, then nosaw-cut 7 is formed in the nut as the side wall 9 will be thin enough topermit of its being closed down onto the locking pin as aforesaid and inorder to facilitate this the side wall 9 may as aforesaid be divided byone or more cross sawcuts.

It will be evident that my invention is not confined to any particularsection of locking pin; the round section pin shown in my drawings willanswer well in practice but if desired other sections may advantageouslybe used. Moreover if desired for additional strength the lock nut can besecured by two or more of the said locking pins similarly as abovedescribed with reference to securing the nut by a single locking pin.

WVhat I claim as my invention and desire to secure by Letters Patentis 1. A lock nut having a walled groove or grooves in its top faceapproximately tangential to but slightly intersecting the screw threadof the nut, the outer side wall of said groove or grooves being adaptedto be bent inwardly to secure a locking pin within the groove and ininterlocking engagement with a groove in the bolt.

2. The combination with a screw threaded bolt of a lock nut thereonhaving a walled groove or grooves in its top face approximatelytangential to but slightly intersecting the screw thread of the nut, agroove formed in one side of the bolt corresponding with the groove inthe nut, and a looking pin located in said groove of the nut and in theside groove of the bolt and there retained by the outer side wall of thegroove being bent inwardly on to the locking pin.

3. A lock nut having a walled groove or grooves in its top faceapproximately tangential to but slightly intersecting the screw threadof the nut, the outer side wall of said groove or grooves being formedwith a saw cut parallel with the groove so that the said wall can bebent inwardly to secure a lock ing pin within the groove and ininterlocking engagement with the groove in the bolt.

A lock nut having two walled grooves in its top face approximatelytangential to but slightly intersecting the screw thread of the nut andarranged parallel to one another at opposite sides of the hole in thenut, the outer side wall of each of said grooves being adapted to bebent inwardly to secure a locking pin within the groove and ininterlocking engagement with the groove in the bolt, one of said groovesbeing shallower than the other groove by a distance equal to half thepitch of the thread in the nut.

In testimony whereof I aflix my signature in presence of two witnesses;

HUBERT DOLLMAN. Witnesses:

Eunns'r I'IARKER, CHARLES Boswon'rH KETLEY.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

